某大跨度双塔连体高层结构抗震优化设计  

Seismic optimization design of a twin- tower tall building with connective structure

作　　者：聂祺[1] 唐曹明[1,2] 杨韬[1,2] 

机构地区：[1]中国建筑科学研究院,北京100013 [2]住房和城乡建设部防灾研究中心,北京100013

出　　处：《四川建筑科学研究》2015年第2期175-178,187,共5页Sichuan Building Science

摘　　要：某高层大跨度双塔连体建筑,由两栋塔楼和一个连廊组成。由于连廊跨度达到53 m,如果连廊与塔楼之间采用常规刚性连接方案,静载作用下连廊会有一个较大的剪力传递给塔楼,使塔楼在竖向静载作用下就产生较大的剪力,导致原设计中塔楼内墙体多、墙厚大,抗侧刚度过大,结构基本周期小于场地特征周期,抗震性能不理想。为此,对原设计进行优化,采用控制施工过程中连廊支承方式的方法来解决分配给塔楼的作用过大的问题,即在施工阶段将连廊钢结构两端支座处理成滑动支座,待主体结构施工完成后再将连廊钢结构支座处理成刚接支座,从而减少静载作用下分配给塔楼的内力。在此基础上,优化左右塔楼的墙体布置,并按施工过程进行模拟分析,得出结构的内力分布规律。方案调整前后对比分析表明,采用控制钢桁架支座连接形式的方法有效地改善了结构的受力状态,在提高了结构安全性的前提下降低结构成本,相关设计思路可为大跨度连体结构设计和施工提供参考。Optimization is made for a twin-tower tall building composed of two towers and gallery. The span of gallery reaches 53 m. When conventional rigid connection is used between gallery and towers, there exists greater shear transferring from gallery to tower and very large shear forces in towers under static loads. As a result, too many shear walls have to be placed in the original design, the thickness and lateral stiffness of the shear wall are also too big. The fundamental period of structure is tess than the characteristic site period, seismic performance is not satisfactory. In this paper, optimization is performed for the original design. The bearing of the gallery is controlled in construction process to solve the problem that moment generated in towers is too big, namely the bearings of steel gallery is treated as sliding beatings at both ends during the construction phase, after completion of the main structure construction, it is treated as rigid beatings, thereby reducing the internal forces assigned to the tower under static loads. On this basis, the plan layout of shear wall in towers is optimized, analysis is carried out to simulate the construction process, and intemal force distribution of structure is obtained. Comparative analysis shows that by controlling the bearings of steel truss, the stress state of the towers is effectively improves. Structural costs is reduced while guarantee the safety of the structure. This design optimization provides a new idea for large-span twin-tower structural design and construction.

关 键 词：双塔连体结构 施工过程分析 抗震优化设计 

分 类 号：TU375[建筑科学—结构工程]